Key differences of BS EN 12811 / BS5973
1.Calculation Method: The new directive will require that engineers use the limit state method for engineering rather than the permissible stress method (see definition below). The NASC Guide allows for the limit state approach to analysis
of access scaffolds and provides solutions, which do not need further design.
2. Ties: There will be an increase in the number of ties for particular heights used in traditional tube and fitting scaffolds. This could slow down the erection process. The NASC Guide provides details of the minimum ties required to satisfy BS EN
12811-1.